GoAir — flight cancelled and informed 15 days late about it

Address:

Ranga Reddy, Andhra Pradesh, 500084

I received a call followed by an email that the flight g8515, with PNR X41BSL for 5th Fed 2020 is canceled. I was asked to reach to customer care. Noone is responding on both the numbers provided[protected]/[protected].
I looked for the flight history and found the flight in question is canceled since 16th Jan 2020. However, go air took its own sweet time to inform the customer after ensuring that the other direct flight options have prices touching the roof.
Its a gross negligence on the airlines end and they informed the customer at the last moment deliberately.

Request airline to provide me a complete refund plus the extra charges incurred to book fresh tickets with other airlines.